JP6567713B1 - Absorbent articles - Google Patents

Abstract

Disclosed is a slim type absorbent article in which the thickness of an absorbent body is reduced to suppress diffusion of body fluid in a planar direction. SOLUTION: A core press 10 is formed on at least a surface of the absorbent body 4 on the surface sheet 3 side, which is depressed toward the back sheet 2 side, and compresses the thickness of the absorbent body 4 in the thickness direction. A pair of left and right squeezing grooves 12, 12 are formed along the longitudinal direction of the sanitary napkin 1 on at least both sides of the region corresponding to the discharge part H, and at least between the left and right squeezing grooves 12, 12 of the absorbent body 4. In addition, a high absorption portion 15 having a larger absorption capacity per unit area than other portions is formed. [Selection] Figure 1

Description

  The present invention is an absorbent article mainly used for sanitary napkins, vaginal sheets, incontinence pads, toiletries, etc., and more specifically, in a slim type absorbent article with a thinned absorbent body, the planar direction The present invention relates to an absorbent article that suppresses diffusion of body fluids.

  Conventionally, the absorbent article is composed of a cotton-like pulp or the like between a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet. The thing which interposed the absorber is known.

  The slim-type absorbent article in which the thickness of the absorbent body is reduced has the advantages that the discomfort at the time of wearing can be reduced, and the unevenness of the absorbent article at the time of wearing becomes difficult to see from the outside of the clothes (it does not resonate with the outer). Because it is widely offered to the market.

  However, since the thickness is small, the absorption capacity per unit area is small, and the liquid holding ability in the thickness direction is low, so that the body fluid easily diffuses in the plane direction. For this reason, there was a drawback that leakage (lateral leakage) from the edge in the width direction of the absorber is particularly likely to occur. In addition, since the wearer feels uneasy about leakage, inconvenience in life has occurred, such as frequent replacement of absorbent articles.

  Conventionally, as a technique for preventing such side leakage, compressed grooves that have been recessed from the skin side of the surface sheet to the non-skin side along the longitudinal direction on both sides of the region corresponding to the body fluid discharge part of the wearer. There are a number of references on it. For example, Patent Document 1 below discloses an absorbent article in which a reference mark, which is a continuous or discontinuous outline surrounding a predetermined range of the liquid receiving portion, is provided at a position where it can be viewed from the surface side. .

  Moreover, in the following patent document 2, the pressing part which compressed the surface sheet and the absorber in the thickness direction of the absorbent article is formed in the absorber, and the said pressing part opposes a wearer's excretion opening | mouth. Provided in the central region including the center of the excretory opening contact region, and the plurality of intermittently formed point-like central squeezed portions, provided on the outer side in the width direction of the absorbent article than the central region, And the longitudinal direction pressing part extended in the longitudinal direction of an absorptive article, The longitudinal direction pressing part is dented toward the back sheet side from the surface sheet side, and the central pressing part is from the back sheet side. An absorbent article that is recessed toward the topsheet side is disclosed.

JP 2003-126140 A JP 2013-34525 A

  However, since the absorbent article described in the above-mentioned Patent Document 1 is not a thinned absorbent body, there is a drawback that it is easy to feel uncomfortable at the time of wearing, and it tends to resonate on the outer. Moreover, in the absorbent article described in the above-mentioned Patent Document 2, a plurality of dot-like central pressing parts are formed. The central pressing part is discharged from the wearer while preventing damage to the surface sheet due to heat. The body fluid to be drawn can be drawn by the surface sheet, and the effect of reducing the thickness of the absorber cannot be expected so much. Therefore, there are the same drawbacks as in Patent Document 1.

  As described above, since Patent Documents 1 and 2 are not intended for absorbent articles having a thin absorber, the absorption capacity per unit area of the absorber when a thin absorber is used. However, there is no problem that side leakage is likely to occur in the plane direction.

  Then, the main subject of this invention is providing the absorbent article which suppressed the spreading | diffusion of the bodily fluid to a plane direction in the slim type absorbent article which reduced the thickness of the absorber.

In order to solve the above problems, as the present invention according to claim 1, in an absorbent article in which an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet,
A core press that compresses the thickness of the absorber in the thickness direction and is depressed in the thickness direction on at least the surface of the absorber on the surface sheet side, and is formed in the same pattern throughout the absorber, and A pair of left and right squeezing grooves are formed along the longitudinal direction of the absorbent article on at least both sides of the region corresponding to the body fluid discharge portion of the wearer,
The core press is inclined to one side in the width direction and intersects with the first linear press portions disposed in a plurality of positions at predetermined intervals in the longitudinal direction, and the first linear press portion. A grid-like pattern configured by a plurality of second linear press portions that are inclined to the other side of the direction and arranged at a predetermined interval in the longitudinal direction, and the first linear press portion and The length of one side of each grid partitioned by the second linear press portion is 4 to 10 mm, and each of the grids is separated from the first linear press portion and the second linear press portion. In the central part of the lattice, a dot-shaped or dot-shaped central press part consisting of a circle or a polygon is formed,
A non-pressed part is formed with a predetermined width around the compressed groove by intermittently pressing the core press at a portion overlapping with the compressed groove and the vicinity thereof.
There is provided an absorbent article characterized in that a high-absorption part having a larger absorption capacity per unit area than other parts is formed between at least the left and right pressing grooves of the absorbent body.

  In the first aspect of the present invention, the core press is applied to the absorbent body to compress the thickness of the absorbent body in the thickness direction to reduce the thickness. In an absorbent body provided with such a core press, conventionally, body fluid diffuses through the core press portion where the fibers are densified by compression, and in particular, leakage (lateral leakage) occurs from the edge in the width direction. In the present invention, the absorbent body is formed by forming a pair of left and right squeezing grooves along the longitudinal direction of the absorbent article on at least both sides of the region corresponding to the body fluid discharge part of the wearer. Since the high absorption part which made the absorption capacity per unit area larger than other parts was formed between at least the left and right pressing grooves of the absorber, while blocking liquid diffusion to the width direction edge of the The absorbed body fluid can be absorbed and held in the absorber without diffusing in the plane direction.

  Therefore, in the slim type absorbent article in which the thickness of the absorbent body is reduced, it is possible to provide an absorbent article that suppresses diffusion of body fluids in the planar direction, particularly in the width direction.

The core press is inclined to one side in the width direction and intersects with the first linear press portions disposed in a plurality of positions at predetermined intervals in the longitudinal direction, and the first linear press portion. A grid-like pattern configured by a plurality of second linear press portions that are inclined to the other side of the direction and arranged at a predetermined interval in the longitudinal direction, and the first linear press portion and The length of one side of each grid partitioned by the second linear press portion is 4 to 10 mm, and each of the grids is separated from the first linear press portion and the second linear press portion. A dot-shaped or dot-shaped center press portion made of a circle or a polygon is formed at the center of the lattice.

  The core press is formed in a lattice pattern including a first linear press portion and a second linear press portion that are inclined in different directions, whereby the first linear press portion and the first linear press portion and the second linear press portion are formed. Since body fluid diffuses along the two linear press portions, diffusion in the width direction can be suppressed, and the absorbent body obliquely extends along the first linear press portion and the second linear press portion. It becomes easy to deform | transform, and when a twist acts on an absorber, it becomes easy to follow a body movement.

In addition, a dot-shaped or dot-shaped center press portion having a circular shape or a polygonal shape is formed at the center portion of each lattice that is separated from the first linear press portion and the second linear press portion. Thereby, it is suppressed that the center part of each grating | lattice bulges to the skin side, and it becomes possible to make thin the whole absorber reliably, without increasing the hardness of the absorber 4 very much. In addition, the body fluid that has penetrated into each lattice portion is likely to diffuse toward the central press portion having a high density due to capillary action, so that the diffusibility is improved and the body fluid can be quickly absorbed.

  Further, the core press is intermittently formed at a portion overlapping with the compressed groove and in the vicinity thereof, whereby a non-pressed portion is formed with a predetermined width around the compressed groove. Since the bodily fluid that has diffused along the path is temporarily held before reaching the squeezing groove, the diffusion rate of the bodily fluid decreases, and thereafter, it becomes easy to diffuse along the squeezing groove.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the squeezing groove is formed so as to surround a region corresponding to the body fluid discharge portion of the wearer.

  In the invention of the second aspect, by forming the compressed groove so as to surround the periphery of the region corresponding to the body fluid discharge portion of the wearer, diffusion in the front-rear direction can be suppressed in addition to the width direction. Therefore, it is possible to reliably prevent leakage from the edge of the absorber.

  As this invention which concerns on Claim 3, the said pressing groove is formed in multiple numbers at least on both sides of the area | region corresponding to a wearer's bodily fluid discharge | emission part, and an inner area | region is more than an outer area | region from the said pressing groove as a boundary. The absorbent article according to any one of claims 1 and 2, wherein the absorbent capacity per unit area of the absorbent body is set large.

  In the invention according to claim 3, when a plurality of the compressed grooves are formed on both sides, the absorption capacity per unit area is changed step by step with the compressed grooves as a boundary. As a result, diffusion of body fluid can be further suppressed, and side leakage can be more reliably prevented. The absorption capacity per unit area can be adjusted by changing the basis weight of the pulp and the superabsorbent polymer or the type of the superabsorbent polymer.

As the present invention according to claim 4, before and after the region corresponding to the fluid discharge region of the wearer, to claim 1-3 or the compression grooves of the front and rear pairs along the width direction of the absorbent article is formed The absorbent article described is provided.

In the invention according to claim 4 , body fluid diffusion in the front-rear direction is formed by forming a pair of front and rear squeezing grooves along the width direction of the absorbent article before and after the region corresponding to the body fluid discharge part of the wearer. In addition to enhancing the effect of preventing leakage from the front and rear ends of the absorbent body, the squeezing grooves of the front and rear pairs function as a bending guide line for facilitating deformation of the absorbent body along the front and rear roundness. To have.

  As described above in detail, according to the present invention, in a slim type absorbent article in which the thickness of the absorbent body is reduced, diffusion of body fluid in the plane direction can be suppressed, and in particular, side leakage can be prevented.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view of FIG. 4 is a plan view of the absorber 4. FIG. It is the IV-IV line arrow directional view of FIG. It is a top view of absorber 4 concerning a modification. It is a top view of absorber 4 concerning a modification. It is a top view of absorber 4 concerning a modification. It is a cross-sectional view of the sanitary napkin 1 according to another embodiment. It is a cross-sectional view of the sanitary napkin 1 according to another embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the present invention has a liquid-impervious back sheet 2 made of a polyethylene sheet or the like, menstrual blood, or urine (hereinafter collectively referred to as body fluid). .)), A liquid-permeable surface sheet 3, an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3, and both side portions on the skin contact surface side. And side nonwoven fabrics 7, 7 provided over substantially the entire length in the longitudinal direction, and around the absorbent body 4, the outer edges of the back sheet 2 and the top sheet 3 are at the upper and lower edges. The back sheet 2 and the side nonwoven fabric 7 which are joined by joining means such as an adhesive such as hot melt, a heat seal, an ultrasonic seal, etc., and extend laterally from the absorbent body 4 at both side edges thereof. Such as hot melt Chakuzai and heat sealed, are joined by a joining means such as ultrasonic sealing, in which a pair of left and right wing-shaped flaps W, W are formed in the corresponding absorber body side portion located substantially fluid discharge portion H. In the illustrated example, the absorbent body 4 is surrounded by a wrapping sheet 5 made of crepe paper or nonwoven fabric in order to maintain the shape of the absorbent body 4 and improve the diffusibility. It does not have to be provided. Moreover, although not shown in figure, you may arrange | position the 2nd sheet | seat which consists of a hydrophilic nonwoven fabric etc. of the substantially same shape as the said surface sheet 3 adjacent to the non-skin side of the said surface sheet 3.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the back sheet 2, a sheet material having at least water shielding properties such as polyethylene is used, but it is desirable to use a material having moisture permeability from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used. One or a plurality of adhesive layers (not shown) are formed on the non-skin side surface (outer surface) of the back sheet 2 along the longitudinal direction of the napkin, and the sanitary napkin 1 is fixed to the underwear when worn on the body. It is like that. As the back sheet 2, a polylaminate nonwoven fabric in which a plastic film and a nonwoven fabric are laminated may be used.

  Next, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used as the top sheet 3. As the material fibers constituting the nonwoven fabric, in addition to olefins such as polyethylene or polypropylene, polyesters, polyamides, and other synthetic fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of bulkiness and high compression recovery. When a large number of through holes are formed in the surface sheet 3, body fluid is quickly absorbed, and the dry touch properties are excellent. The non-woven fiber may be either a long fiber or a short fiber, but preferably a short fiber is used in order to give a towel texture. In order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Moreover, a core-sheath fiber, a side-by-side fiber, or a split fiber composite fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be suitably used.

  The width dimension of the top sheet 3 is slightly longer than the width dimension of the absorbent body 4 as shown in the cross-sectional view of FIG. 2 and is absorbed in a predetermined section in the longitudinal direction of the napkin including the body fluid discharge portion H. It only stops covering the body 4, and the outer side of the body 4 is prevented from penetrating the side non-woven fabric 7, which is different from the top sheet 3, specifically menstrual blood or a cage, etc. Depending on the purpose, a side nonwoven fabric 7 constituted by using a nonwoven fabric material subjected to appropriate water repellent treatment or hydrophilic treatment is disposed.

The side nonwoven fabric 7 can be made of natural fiber, synthetic fiber, regenerated fiber, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 7 eliminates the feeling of stickiness and prevents stuffiness. For this reason, it is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 13 to 23 g / m ² , and silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. in order to reliably prevent permeation of body fluids. A water repellent nonwoven fabric coated with is preferably used.

  As shown in FIG. 2, the side nonwoven fabric 7 is bonded to the outer portion from the intermediate portion in the width direction with an adhesive such as hot melt over a range from a predetermined inner position to the outer edge of the back sheet 2. A predetermined flap portion is formed at the position. The flap portion forms a pair of left and right wing-shaped flaps W, W on both sides of a portion substantially corresponding to the body fluid discharge portion H. Adhesive layers (not shown) are provided on the outer surfaces of the back sheet 2 of the wing-shaped flaps W, W, respectively, and when the wing-shaped flaps W, W are attached to a shorts, It is folded back to the opposite side, wrapped around the crotch part of the shorts and fastened. On the other hand, the inner side portion of the side nonwoven fabric 7 is bonded to the absorbent body 4 side (skin side surface of the top sheet 3) in a state of being laminated on the skin side of the top sheet 3.

〔Absorber〕
The absorbent body 4 interposed between the back sheet 2 and the top sheet 3 is made of, for example, pulp and a highly water-absorbing polymer. The superabsorbent polymer is mixed in the pulp constituting the absorber as, for example, granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

The sanitary napkin 1 is a thin slim napkin in which the weight of the absorbent body 4 is lowered. The basis weight of the pulp is 50 to 300 g / m ² , preferably 80 to 220 g / m ^2, and the basis weight of the superabsorbent polymer is 30 to 180 g / m ² , preferably 50 to 160 g / m. ² is good. The basis weights of these pulps and superabsorbent polymers do not need to be constant, and may vary depending on the site of the absorbent body. For example, as will be described in detail later, the superabsorbent portion 15 in which the basis weight of the pulp and the superabsorbent polymer can be increased in a region corresponding to the body fluid discharge portion H of the wearer.

  Synthetic fibers may be mixed in the absorbent body 4. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

  As shown in FIG. 3 and FIG. 4, the core press 10 that is recessed toward the back sheet 2 side (non-skin side) on at least the surface sheet 3 side (skin side surface) of the absorbent body 4. Is formed. This core press 10 is for compressing the thickness of the absorber 4 in the thickness direction, and does not compress the entire surface of the absorber 4 but compresses it in a predetermined pattern with a predetermined interval. It is. Since the portion subjected to the core press 10 is compressed in the thickness direction, the fiber of the portion not subjected to the core press 10 is drawn into this, and the portion not subjected to the core press 10 is affected and compressed to some extent. And the thickness of the absorber 4 whole becomes small in the thickness direction. The “thickness of the absorbent body 4” is the total thickness of the absorbent body 4 and specifically the maximum thickness measured at the thickest part.

As a ratio of the thickness reduced by applying the core press 10, if the thickness of the absorbent body 4 before applying the core press 10 is t ₀ and the thickness of the absorbent body 4 after applying the core press 10 is t, It is preferable that t / t ₀ is about 1/10 to 7/10. When this ratio is smaller than 1/10, the absorbent body becomes hard and the wearing feeling deteriorates. On the contrary, if it is larger than 7/10, the compression effect by the core press 10 is small, and the thickness of the absorber 4 is large. This ratio can be changed by adjusting the compression depth of the core press 10, the interval between adjacent core presses, the planar pattern of the core press 10, and the like.

  In the illustrated example, the core press 10 is compressed only from the skin side surface (surface on the surface sheet 3 side) of the absorbent body 4 so that a concave depression is formed on the skin side surface of the absorbent body 4, and the non-skin side surface ( The surface on the back sheet 2 side) is formed almost flat. Such processing can be performed by passing an absorbent body between a convex roll having a large number of convex portions formed on the surface and an anvil roll having a flat surface. On the other hand, although not shown in the drawing, by compressing from both the skin side surface and the non-skin screen of the absorbent body 4, concave depressions are formed on both the skin side surface and the non-skin side surface of the absorbent body 4, respectively. Also good. To process in this way, a first convex roll having a large number of convex portions formed on the surface, and a second convex roll having convex portions also formed at positions corresponding to the convex portions of the first convex roll. This can be done by passing between them. By compressing at least the skin side surface, the body fluid that has permeated from the surface sheet 3 side flows into the concave portion of the core press 10 and becomes easy to diffuse along the core press 10, and is absorbed by the absorbent body 4 as needed during the diffusion process. Become so.

  As shown in FIG. 3, the core press 10 is preferably formed in substantially the same pattern on the entire absorbent body 4. That is, the region corresponding to the body fluid discharge portion H of the wearer is applied in the same pattern as the other regions. As a result, the entire absorber 4 can be thinned, the uncomfortable feeling at the time of wearing can be surely reduced, and the outer can be reliably prevented from reverberating.

  The core press 10 can be applied in an arbitrary pattern as long as the thickness of the absorbent body 4 can be compressed in the thickness direction. However, as shown in FIG. 3, the core press 10 is formed continuously between the edges of the absorbent body 4. It is preferable to include a plurality of linear press portions 11, 11. The said linear press part 11 is not formed in the intermediate part which does not reach the outer edge of the absorber 4, but one of the front and rear end edges and the left and right end edges of the absorber 4, and any other one Between the two edges. By forming over the edge of the absorber 4, the whole absorber 4 can be compressed and it can reduce in thickness reliably.

  The core press 10 is inclined to one side in the width direction, and a plurality of first linear press portions 11a, 11a,... Arranged at predetermined intervals in the longitudinal direction, and the first linear press portion 11a. , And a grid pattern formed by a plurality of second linear press portions 11b, 11b,... Arranged at a predetermined interval in the longitudinal direction. preferable. By forming the core press 10 in a lattice pattern, the thickness of the absorber 4 can be more reliably reduced, and the effect of reducing the uncomfortable feeling at the time of mounting and the difficulty of reverberating to the outer becomes remarkable. The first linear press portions 11a ... and the second linear press portions 11b ... are preferably arranged at substantially the same interval, so that the periphery is partitioned by the linear press portions 11a, 11b. A large number of substantially square lattices made of squares or rhombuses are arranged. The substantially square lattice portion surrounded by the linear press portions 11a and 11b is not directly compressed, but the thickness is smaller than the original thickness due to the influence of the linear press portions 11a and 11b.

  The intersecting angle between the first linear press portion 11a and the second linear press portion 11b is substantially a right angle in the illustrated example, but it is sufficient that the angle is about 30 ° to 150 °. The first linear press part 11a and the second linear press part 11b are preferably inclined with respect to the width direction of the sanitary napkin 1. Accordingly, when the left and right legs are moved back and forth during walking or the like, when the force in the torsional direction is applied to the sanitary napkin 1 by the pressure from the inside of the base of the legs, the linear press portions 11a and 11b , The absorber 4 is easily deformed in an oblique direction, and can easily follow the movement of the body. Moreover, since body fluid flows in the width direction of the sanitary napkin 1 along these linear press parts 11a and 11b, a side leak arises compared with the case where the linear press part extended in parallel with the width direction is formed. Can be prevented. From the viewpoint of facilitating such deformation in the oblique direction and preventing side leakage, the linear press portions 11a and 11b are inclined at an angle of 30 ° or more with respect to the width direction of the sanitary napkin 1. It is preferable.

  In order to reduce the thickness of the absorber 4 with certainty, as shown in FIG. 3, the length of one side of each grid defined by the first linear press portion 11a and the second linear press portion 11b is used. The length a is preferably 4 to 10 mm. If it is smaller than 4 mm, the distance between the linear press portions 11a, 11b is too close, the absorber 4 becomes hard, and the wearing feeling deteriorates. On the other hand, if it is larger than 10 mm, the central part of each lattice bulges to the skin side, and the entire absorber 4 cannot be made sufficiently thin. The width of the linear press portions 11a and 11b is preferably 0.5 to 3 mm.

  In order to reduce the thickness of the absorber 4 with certainty, as shown in FIGS. 3 and 4, a dot-like shape made of a circle, a polygon, or the like is provided at the center of each lattice spaced from the linear press portions 11 a and 11 b. Or you may give the dot-shaped center press part 16. FIG. Thereby, it is suppressed that the center part of each grating | lattice bulges to the skin side, and the whole absorber 4 can be thinned reliably, without increasing the hardness of the absorber 4 so much here now. . Further, the body fluid that has penetrated into each lattice portion is likely to diffuse toward the central press portion 16 having a high density due to capillary action, so that the diffusibility is improved and the body fluid can be quickly absorbed. The length a of one side of each lattice when the central press portion 16 is provided can be made longer than the length when the central press portion 16 is not provided. There is no problem from the viewpoint of reducing the thickness.

  The planar shape of each lattice portion partitioned by the core press 10 may be a polygonal pattern of pentagons or more in addition to the quadrangle made of a square or a rhombus as described above. Moreover, in the said form example, although the linear press parts 11a and 11b are formed in the continuous linear form, you may form in the discontinuous linear form which arrange | positioned several dots at intervals.

  As shown in FIGS. 3 and 4, on the surface of the absorbent body 4 on the surface sheet 3 side, in addition to the core press 10, at least both sides of the region corresponding to the body fluid discharge part H of the wearer, A pair of left and right squeezing grooves 12, 12 are formed along the longitudinal direction of the sanitary napkin 1. By forming the compressed groove 12, it is possible to block body fluid that diffuses along the width direction of the sanitary napkin 1 from the region corresponding to the body fluid discharge portion H of the wearer through the core press 10, and Since it can be changed to the flow along the longitudinal direction of the sanitary napkin 1 in which the compressed groove 12 extends, it is possible to prevent body fluid from diffusing up to the edge in the width direction of the absorbent body 4 and to reliably prevent side leakage. Will be able to.

  The compressed groove 12 may be constituted by a concave depression formed only on the skin side surface of the absorbent body 4 by compressing only from the skin side surface of the absorbent body 4, similarly to the core press 10. By compressing from the skin side surface and the non-skin side surface of the absorbent body 4, the absorbent body 4 may be constituted by concave depressions respectively formed on both the skin side surface and the non-skin side surface.

  In the form shown in FIG. 3, the compressed grooves 12 are formed to extend along the longitudinal direction on both side portions of the region corresponding to the body fluid discharge portion H of the wearer. That is, the squeezing grooves 12 and 12 are configured by arcuate lines that are spaced apart from each other at the center in the width direction of the sanitary napkin 1 and arranged independently on the left and right. The squeezing groove 12 extends in the front-rear direction at a length substantially equal to that of the body fluid discharge part H on both sides of the region corresponding to the body fluid discharge part H of the wearer, and is most outward in the width direction at the center in the longitudinal direction. It is preferable to form with a curved shape that bulges.

  Further, as a modification of the compressed groove 12, as shown in FIG. 5, it can be configured by an annular line formed so as to surround a region corresponding to the body fluid discharge portion H of the wearer. Thereby, in addition to diffusion in the width direction, diffusion in the front-rear direction can also be suppressed, and therefore leakage from the edges of the absorber 4 in the width direction and the front-rear direction can be reliably prevented. In this case, the planar shape of the compressed groove 12 is preferably circular, elliptical, or oval.

  As shown in FIG. 6, the compressed grooves 12 extend along the longitudinal direction at least on both sides of the region corresponding to the body fluid discharge part H of the wearer, and are longitudinally compressed grooves 12 a that are separated in the width direction. It is preferable that a plurality of strips are formed. In the example shown in FIG. 6, two longitudinal squeezing grooves 12 a and 12 a are formed on both side portions of the region corresponding to the body fluid discharge portion H of the wearer and spaced apart in the width direction. Among these, the longitudinal direction pressing groove 12a located outside is constituted by a portion extending along the longitudinal direction of the annular line surrounding the periphery of the region corresponding to the body fluid discharge part H of the wearer, and the longitudinal direction pressing groove located inside. The groove 12a is configured by arcuate lines that are spaced apart from each other in the center in the width direction and are independently arranged on the left and right. Thereby, the spreading | diffusion of the bodily fluid to the width direction can be prevented more reliably. The plurality of longitudinal squeezing grooves 12a ... are concentrically arranged around the center of the region corresponding to the body fluid discharge part H of the wearer, and are formed in a curved shape bulging outward substantially parallel. Is preferred. It is preferable that the compressed grooves 12a arranged on the innermost side in the width direction are respectively arranged on both sides of a region corresponding to the vaginal opening of the wearer from the viewpoint of preventing diffusion of body fluid in the width direction.

  In this case, the longitudinal squeezing groove 12 disposed on the outer side in the width direction than the longitudinal squeezing groove 12a disposed on the inner side in the width direction is formed so as to extend relatively longer on the front side and the rear side in the longitudinal direction. Is preferred. Thereby, the body fluid diffused outward in the width direction so as to go around the end portion of the longitudinal compression groove 12a arranged on the inner side in the width direction can be blocked by the longitudinal compression groove 12a arranged on the outer side in the width direction. And diffusion to the outside in the width direction can be more reliably prevented.

  Further, as shown in FIG. 7, the longitudinal squeezing grooves 12 a arranged on the inner side in the width direction are arranged on both sides of the circular annular line arranged so as to surround the area corresponding to the vaginal opening of the wearer. You may comprise by the part extended in the front-back direction. That is, as the squeezing groove, a circular ring surrounding the periphery of the region corresponding to the vaginal opening is formed inside the squeezing groove 12 formed of an elliptical long circular line surrounding the periphery of the region corresponding to the body fluid discharge portion H. You may form with the pattern which consists of a double annular line in which the pressing groove 12 which consists of a line | wire is arrange | positioned.

  On the other hand, as shown in FIG. 7, a pair of front and rear squeezed parts extending in the width direction of the sanitary napkin 1 and spaced in the longitudinal direction before and after the region corresponding to the body fluid discharge part H of the wearer. The groove 12b may be formed by one or a plurality of lines. By providing the pair of width direction compressed grooves 12b in the width direction, diffusion of body fluid in the length direction can be suppressed, leakage from the front and rear ends of the absorbent body 4 can be prevented, and the sanitary napkin 1 can be attached. The pair of front and rear width direction compressed grooves 12b function as bending guide lines when the absorbent body 4 is deformed along the front and rear roundness of the body. The width direction pressing grooves 12b of the pair of front and rear may be constituted by a portion extending in the width direction of the aforementioned annular line, or are independent arcuate lines extending in the width direction while being separated in the longitudinal direction of the sanitary napkin 1. You may comprise. Moreover, you may form multiple width direction pressing grooves 12b ... in the example of illustration by the combination of an annular line and an arcuate line like the example of illustration. As shown in the example, in the case where four widthwise compressed grooves 12b are formed on the front and rear, the widthwise compressed grooves 12b arranged on the outermost side are formed by portions extending in the width direction of an annular line made of an ellipse. And the width direction pressing groove 12b arrange | positioned at the innermost side is formed by the part extended in the width direction of the cyclic | annular annular line, and the two width direction pressing grooves 12b and 12b arrange | positioned in the middle are independent arcuate lines. Preferably formed. As a result, diffusion of bodily fluid in the vicinity of the vaginal opening can be suppressed by the annular squeezing groove arranged on the innermost side, and after the bodily fluid sufficiently diffused and saturated in this region diffuses outward, The body fluid is surely held in the region surrounded by the outermost annular squeezing groove while suppressing the outward diffusion in the longitudinal direction by the arc-shaped widthwise squeezing grooves 12b and 12b.

  As shown in FIG. 3 and FIG. 5 to FIG. 7, the core press 10 is intermittently formed in the vicinity of the portion overlapping the compressed groove 12 and in the vicinity thereof, so that the non-pressed portion 14 has a predetermined width around the compressed groove 12. Is preferably formed. That is, the core press 10 is not formed in the compressed groove 12 portion and a predetermined width around the portion, and a non-pressed region (non-pressed portion 14) is formed between the compressed groove 12 and the core press 10. . By forming the non-pressed part 14 around the compressed groove 12, in the non-pressed part 14, body fluid diffused through the core press 10 is temporarily held before reaching the compressed groove 12, The diffusion rate of the bodily fluid diffused along the core press 10 is abruptly lowered, and thereafter the flow of the bodily fluid along the squeezing groove 12 is easily changed. Further, since the core press 10 is not connected to the outside of the pressing groove 12, body fluid that diffuses along the pressing groove 12 can be prevented from diffusing to the outside through the core press 10, and the body fluid can be surely secured. Can be confined within the range surrounded by the compressed grooves 12.

  The non-pressed portion 14 is formed around the entire circumference of the compressed groove 12 so that the compressed groove 12 and the core press 10 are not directly connected. The width of the non-pressed portion 14 is preferably set to 0.5 to 5 mm from the viewpoint of ensuring a function as a body fluid buffer zone and preventing the absorber 4 from becoming thick.

  It is desirable that the non-pressed portion 14 is also formed around the longitudinal direction compressed groove 12a and the width direction compressed groove 12b. Hereinafter, the “squeezing groove 12” is a concept including the longitudinal pressing groove 12a and the width pressing groove 12b.

  As shown in FIG. 3, the groove width A of the compressed groove 12 is preferably formed larger than the groove width B of the linear press portion 11 of the core press 10 (A> B). Thereby, the body fluid which diffuses along the pressing groove 12 becomes difficult to transfer to the core press 10, and the body fluid can be prevented from diffusing outside the pressing groove 12. The ratio of the groove widths A and B is preferably A / B = 1.5-3.

  In order to form the core press 10 and the compressed groove 12 in the absorbent body 4, the core press 10 and the compressed groove 12 may be simultaneously applied by a convex roll in which convex portions corresponding to the core press 10 and the compressed groove 12 are formed. Alternatively, after the core press 10 is formed, the compressed groove 12 may be formed in the next step.

  In this sanitary napkin 1, as shown in FIGS. 3 and 4, a high absorption capacity per unit area is provided between at least the left and right compressed grooves 12, 12 of the absorbent body 4 than other parts. Absorber 15 is formed. The space between the left and right compressed grooves 12 and 12 is a region including a region corresponding to the body fluid discharge portion H of the wearer. As shown in FIG. 3, when the compressed grooves 12, 12 made of arcuate lines that are independent from each other are arranged on the left and right sides, the high absorption portion 15 is disposed in a portion including a region sandwiched between the compressed grooves 12, 12. As shown in FIG. 5, when the compressed groove 12 formed of an annular line is formed so as to surround the periphery of the region corresponding to the body fluid discharge portion H, the range surrounded by the compressed groove 12 As shown in FIGS. 6 and 7, a compression groove is formed inside the compression groove 12 formed of an annular line formed so as to surround the periphery of the region corresponding to the body fluid discharge portion H of the wearer. In the case of being formed, it is formed within a range surrounded by the outermost pressing groove 12. The high absorption part 15 is formed between at least the pressing grooves 12 and 12 described above when the arcuate pressing grooves 12 and 12 are formed independently on both sides as shown in FIG. It means that the absorbent portion 15 may be formed to extend to either one or both of the front and rear sides of the portion sandwiched between the compressed grooves 12 and 12, or both in the illustrated example. The high absorption portion 15 is preferably formed in almost the entire region between the left and right pressing grooves 12, 12, but may be formed at least in part. As shown in FIG. 5 to FIG. 7, when the compressed groove 12 is formed by an annular line surrounding the periphery of the region corresponding to the body fluid discharge part H of the wearer, the high absorbent part 15 has the compressed groove 12. Preferably, it is formed over almost the entire region in the region surrounded by.

  The high absorption part 15 is set to have a larger absorption capacity per unit area than other parts. By providing the high absorption portion 15 in the region corresponding to the wearer's body fluid discharge portion H, the discharged body fluid can be sufficiently absorbed and held in the high absorption portion 15 and the body fluid diffuses to the region outside the high absorption portion 15. Can be suppressed. Moreover, it is suppressed that the site | part enclosed by the pressing groove 12 becomes a capacity | capacitance over (saturated state), and a body fluid spread | diffuses outside so that it may overflow to the outer side of the pressing groove 12. FIG.

The absorption capacity per unit area is measured as follows.
(1) Under the tension state of the napkin (in a state where the napkin is unfolded along the plane without wrinkles or folds), the superabsorbent portion 15 and other portions are cut out and the area is measured at that time. At this time, the back sheet 2 and the top sheet 3 are previously removed.
(2) Put each divided part in a separate mesh bag, close the mouth, immerse it in 0.9% by weight physiological saline, and leave it for 30 minutes.
(3) Use a centrifugal dehydrator (10G) for 3 minutes to dehydrate.
(4) The absorption capacity per unit area of each part is calculated from the following equation.
Absorption capacity per unit area (g / cm ² ) = ((weight after dehydration (g) − (weight before liquid immersion (g)) / area of each part (cm ² )
Absorption capacity per unit area were measured as described above, in the high absorption part 15, 0.3 to 2.0 g / cm ^2, and it is preferably a 0.3 to 1.0 g / cm ² . In addition, the absorption capacity per unit area in the high absorption part 15 is 1.5 to 5 times, preferably 1.5 to 2.5 times the absorption capacity per unit area in other parts. Good.

  Increasing the absorption capacity per unit area can be achieved by increasing the basis weight of the pulp and the superabsorbent polymer or changing the type of superabsorbent polymer to one having a large amount of water absorption. When increasing the basis weight of pulp and superabsorbent polymer, if only the basis weight of superabsorbent polymer is increased, this area will become harder and it will be easier to feel the grain of superabsorbent polymer when worn. It is preferable to increase the basis weight of the pulp at a rate approximately equal to the rate of increase of The increase ratio of the basis weight of the pulp and the superabsorbent polymer in the high absorption part 15 is 1.5 to 5 times, preferably 1.5 to 2.5 times that of other regions. By increasing the basis weight of the pulp and the superabsorbent polymer, the thickness of the superabsorbent portion 15 is increased as compared with other regions. However, since the core press 10 is also applied to the superabsorbent portion 15, Even if there is an increase in thickness, it does not affect the wearing feeling. Specifically, the difference in thickness between the high absorption portion 15 and other regions varies depending on the overall thickness of the absorber 4, but is preferably suppressed to an increase of 1 mm or less.

  When the absorption capacity per unit area is increased by increasing the basis weight of the pulp and the superabsorbent polymer, the rigidity of the high absorbent portion 15 is relatively high and the rigidity of other parts is relatively low. The region corresponding to the body fluid discharge part H of the wearer is in close contact with the body, and the other part can easily follow the movement of the body.

  In the case of increasing the absorption capacity per unit area depending on the type of the superabsorbent polymer, the superabsorbent portion 15 may be formed by using a superabsorbent polymer having a large amount of water absorption determined in accordance with JIS K7223. it can.

  As shown in FIG. 6, when a plurality of longitudinal compression grooves 12a are formed on at least both sides of the region corresponding to the body fluid discharge part H of the wearer, the longitudinal compression grooves 12a are used as inner boundaries. This region can be set so that the absorption capacity per unit area of the absorber is higher than the outer region. From the inner region toward the outer region, by gradually reducing the absorption capacity per unit area with the longitudinal compressed groove 12a as a boundary, the outer region is sufficiently absorbed by the inner region. Therefore, the diffusion of body fluid can be further suppressed, and side leakage can be reliably prevented. In the example shown in FIG. 6, two longitudinal squeezing grooves 12a and 12a are formed on both sides, and the central part between the inner longitudinal squeezing grooves 12a and 12a has the highest absorption capacity per unit area. Middle absorption part 15b which is made into absorption part 15a, and the annular part between outside longitudinal direction compression groove 12a and inside longitudinal direction compression groove 12a has lower absorption capacity per unit area than high absorption part 15a of the central part The outer portion of the outer longitudinal direction pressing groove 12a (the pressing groove 12) is the low absorption portion having the lowest absorption capacity per unit area.

  In the sanitary napkin 1 having the above-described configuration, the core press 10 is applied to the absorbent body 4 so that the thickness of the absorbent body 4 is reduced in the thickness direction. As the body fluid diffuses, there is a concern that lateral leakage from the edge in the width direction in particular will occur, but along the longitudinal direction of the sanitary napkin 1 on at least both sides of the region corresponding to the body fluid discharge portion H of the wearer. Since the pair of left and right squeezing grooves 12 and 12 are formed, the body fluid that diffuses to the edge in the width direction of the absorbent body 4 is blocked, and other parts are provided between at least the left and right squeezing grooves 12 and 12 of the absorbent body 4. Since the high absorption part 15 having a higher absorption capacity per unit area than the part is formed, the discharged body fluid can be absorbed and held in the absorbent body 4 without being diffused in the plane direction.

[Other examples]
In the said form example, as FIG. 2 shows, the said compression groove | channel 12 squeezes only the absorber 4 or the covering sheet 5 and the absorber 4 by compression from the skin side of the absorber 4, Although the surface sheet 3 covered the skin side of the pressing groove 12 while forming a space in the pressing groove 12, the surface sheet 3 was placed on the skin side of the absorbent body 4 as shown in FIG. In a state in which the top sheet 3 is laminated, the top sheet 3 and the absorbent body 4 are integrally depressed by pressing from the skin side of the top sheet 3, and the top sheet 3 is disposed along the side surface and bottom surface of the pressing groove 12. You may form by the hollow part. By denting the top sheet 3 integrally with the absorbent body 4 in the compressed groove 12, body fluid flowing on the outer side in the width direction on the surface of the top sheet 3 flows into the recessed portion of the compressed groove 12. Then, the absorbent 4 is absorbed from the compressed groove 12, and the side leakage caused by flowing the surface sideways can be prevented. Moreover, because the topsheet 3 and the absorbent body 4 are recessed integrally, the topsheet 3 and the absorbent body 4 are integrated between the left and right squeezing grooves 12 and 12 and are in close contact with the body fluid discharge part H of the wearer. The fit to the body is good, the absorption performance of body fluid can be improved, and the wearing feeling can be improved.

  Moreover, as FIG. 9 shows, the left-right paired compression groove | channels 12 and 12 which squeezed only the absorber or the covering sheet 5 and the absorber 4 were formed by the compression from the skin side of the absorber 4. As shown in FIG. Then, in the state which laminated | stacked the surface sheet 3 on the skin side of the absorber 4, it is spaced apart to the width direction outer side of the said pressing grooves 12, 12 by the pressing from the skin side of the said surface sheet 3, and the said surface sheet 3 and The absorbent body 4 may be recessed integrally to form the pressing groove 13 in which the topsheet 3 is disposed along the side surface and the bottom surface of the recessed portion. By forming the pressing groove 13 in which the top sheet 3 and the absorber 4 are integrally recessed outside the pressing groove 12 in which only the absorber 4 is recessed, the leakage preventing effect is further improved.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Back sheet, 3 ... Front sheet, 4 ... Absorber, 5 ... Encapsulating sheet, 7 ... Side nonwoven fabric, 10 ... Core press, 11 ... Linear press part, 11a ... 1st line 11b ... second linear press part, 12 ... pressing groove, 12a ... longitudinal pressing groove, 12b ... width pressing groove, 13 ... pressing groove, 14 ... non-pressing part, 15 ... high absorption part, 16 ... Central press

Claims (4)

In an absorbent article in which an absorber is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet,
A core press that compresses the thickness of the absorber in the thickness direction and is depressed in the thickness direction on at least the surface of the absorber on the surface sheet side, and is formed in the same pattern throughout the absorber, and A pair of left and right squeezing grooves are formed along the longitudinal direction of the absorbent article on at least both sides of the region corresponding to the body fluid discharge portion of the wearer,
The core press is inclined to one side in the width direction and intersects with the first linear press portions disposed in a plurality of positions at predetermined intervals in the longitudinal direction, and the first linear press portion. A grid-like pattern configured by a plurality of second linear press portions that are inclined to the other side of the direction and arranged at a predetermined interval in the longitudinal direction, and the first linear press portion and The length of one side of each grid partitioned by the second linear press portion is 4 to 10 mm, and each of the grids is separated from the first linear press portion and the second linear press portion. In the central part of the lattice, a dot-shaped or dot-shaped central press part consisting of a circle or a polygon is formed,
A non-pressed part is formed with a predetermined width around the compressed groove by intermittently pressing the core press at a portion overlapping with the compressed groove and the vicinity thereof.
An absorbent article, wherein a high absorption part having a larger absorption capacity per unit area than other parts is formed between at least the left and right pressing grooves of the absorbent body.   The absorbent article of Claim 1 currently formed so that the said pressing groove may surround the circumference | surroundings of the area | region corresponding to a wearer's bodily fluid discharge | emission part.   A plurality of longitudinal squeezing grooves extending along the longitudinal direction and spaced apart in the width direction are formed on at least both sides of the region corresponding to the body fluid discharge part of the wearer, with the longitudinal squeezing groove as a boundary, The absorbent article according to claim 1, wherein an absorption capacity per unit area of the absorbent body is set larger in the inner area than in the outer area. The absorbent article according to any one of claims 1 to 3, wherein a pair of front and rear compressed grooves are formed along the width direction of the absorbent article before and after the region corresponding to the body fluid discharge portion of the wearer.

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